Example: 1


	<?php

	//strrev();
	//strtolower();
	//strtoupper();
	//substr_count();
	//substr_replace();


	//strrev();

	echo strrev("Hellow");

	?>


	
Example: 2


	<?php

	//strrev();
	//strtolower();
	//strtoupper();
	//substr_count();
	//substr_replace();


	//strtolower();

	$string ="HELLOW";
	echo strtolower($string);

	?>



Example 3


	<?php

	//strrev();
	//strtolower();
	//strtoupper();
	//substr_count();
	//substr_replace();


	//strtolower();

	$string ="hellow";
	echo strtoupper($string);

	?>



Example 4


	<?php

	//strrev();
	//strtolower();
	//strtoupper();
	//substr_count();
	//substr_replace();


	//strtolower();

	$string ="hellow";
	echo strtoupper($string);

	?>



Example 5


	<?php

	//strrev();
	//strtolower();
	//strtoupper();
	//substr_count();
	//substr_replace();


	//strtolower();

	$username ="hellow";
	$storedusername= strtoupper($username);

	?>


Example 6


	<?php

	//strrev();
	//strtolower();
	//strtoupper();
	//substr_count();
	//substr_replace();

	//substr_count();

	$search ="My name is alex. What is Your name?";
	$result =substr_count($search,"alex");
	echo $result;

	?>


Example 7


	<?php

	//strrev();
	//strtolower();
	//strtoupper();
	//substr_count();
	//substr_replace();

	//substr_count();

	$search ="My name is alex. What is Your name?";
	$result =substr_count($search,"name");
	echo $result;

	?>


Example 8


	<?php

	//strrev();
	//strtolower();
	//strtoupper();
	//substr_count();
	//substr_replace();

	//substr_count();

	$search ="My name is alex. What is Your name?";
	$result =substr_count($search,"name",7);
	echo $result;

	?>


Example 9


	<?php

	//strrev();
	//strtolower();
	//strtoupper();
	//substr_count();
	//substr_replace();

	//substr_count();

	$search ="My name is alex. What is Your name?";
	$result =substr_count($search,"name",7,17);
	echo $result;

	?>


Example 10


	<?php

	//strrev();
	//strtolower();
	//strtoupper();
	//substr_count();
	//substr_replace();

	//substr_count();

	$search ="My name is alex. What is Your name?";
	$result =substr_count($search,"alex",7,17);
	echo $result;

	?>



Example 11


	<?php

	//strrev();
	//strtolower();
	//strtoupper();
	//substr_count();
	//substr_replace();

	//substr_replace();

	$replace ="My name is alex.";
	$result =substr_replace($replace,"Billy",11,14);
	echo $result;

	?>


Example 12



	<?php

	//strrev();
	//strtolower();
	//strtoupper();
	//substr_count();
	//substr_replace();

	//substr_replace();

	$replace ="My name is alex.";
	$result =substr_replace($replace,"Billy",10,14);
	echo $result;

	?>





